#region Apache License
//
// Licensed to the Apache Software Foundation (ASF) under one or more 
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership. 
// The ASF licenses this file to you under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with 
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion

#if !NETCF
using System;
using System.Collections;

namespace log4net.Util
{
    /// <summary>
    /// Implementation of Stacks collection for the <see cref="log4net.LogicalThreadContext"/>
    /// </summary>
    /// <remarks>
    /// <para>
    /// Implementation of Stacks collection for the <see cref="log4net.LogicalThreadContext"/>
    /// </para>
    /// </remarks>
    /// <author>Nicko Cadell</author>
    public sealed class LogicalThreadContextStacks
    {
        private readonly LogicalThreadContextProperties m_properties;

        #region Public Instance Constructors

        /// <summary>
        /// Internal constructor
        /// </summary>
        /// <remarks>
        /// <para>
        /// Initializes a new instance of the <see cref="ThreadContextStacks" /> class.
        /// </para>
        /// </remarks>
        internal LogicalThreadContextStacks(LogicalThreadContextProperties properties)
        {
            m_properties = properties;
        }

        #endregion Public Instance Constructors

        #region Public Instance Properties

        /// <summary>
        /// Gets the named thread context stack
        /// </summary>
        /// <value>
        /// The named stack
        /// </value>
        /// <remarks>
        /// <para>
        /// Gets the named thread context stack
        /// </para>
        /// </remarks>
        public LogicalThreadContextStack this[string key]
        {
            get
            {
                LogicalThreadContextStack stack = null;

                object propertyValue = m_properties[key];
                if (propertyValue == null) {
                    // Stack does not exist, create
#if NET_2_0 || MONO_2_0
                    stack = new LogicalThreadContextStack(key, registerNew);
#else
					stack = new LogicalThreadContextStack(key, new TwoArgAction(registerNew));
#endif
                    m_properties[key] = stack;
                }
                else {
                    // Look for existing stack
                    stack = propertyValue as LogicalThreadContextStack;
                    if (stack == null) {
                        // Property is not set to a stack!
                        string propertyValueString = SystemInfo.NullText;

                        try {
                            propertyValueString = propertyValue.ToString();
                        }
                        catch {
                        }

                        LogLog.Error(declaringType, "ThreadContextStacks: Request for stack named [" + key + "] failed because a property with the same name exists which is a [" + propertyValue.GetType().Name + "] with value [" + propertyValueString + "]");

#if NET_2_0 || MONO_2_0
                        stack = new LogicalThreadContextStack(key, registerNew);
#else
						stack = new LogicalThreadContextStack(key, new TwoArgAction(registerNew));
#endif
                    }
                }

                return stack;
            }
        }

        #endregion Public Instance Properties

        #region Private Instance Fields

        private void registerNew(string stackName, LogicalThreadContextStack stack)
        {
            m_properties[stackName] = stack;
        }

        #endregion Private Instance Fields

        #region Private Static Fields

        /// <summary>
        /// The fully qualified type of the ThreadContextStacks class.
        /// </summary>
        /// <remarks>
        /// Used by the internal logger to record the Type of the
        /// log message.
        /// </remarks>
        private readonly static Type declaringType = typeof(LogicalThreadContextStacks);

        #endregion Private Static Fields
    }
}

#endif
